Yea the problem is they will not let you have anything in your pockets because if you reach into your pocket they can disqualify your exam (this is what I was told...). You can have whatever is in your mouth going in and then take breaks to get some out of your locker... What exam are you taking? If AUD, you should have time for breaks... If BEC, I never had time... as for the others I have not taken them so I cannot be sure. Hope this helps!
BEC: 73,81(7/6/2010); AUD: 75(5/24/2010); FAR: 76(8/31/2010); REG: 77 (10/18/2010) - DONE!!!!